JP2003094142A - Gear part and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and weight-reduced gear part through the integration of a gear member and a rotary member, and a mass productive manufacturing method for the gear part. SOLUTION: In a manufacturing method for the gear part comprised of the gear member and the rotary member, an intermediately formed work 5 is formed in a first process, which is comprised of the rotary member 3 and a preliminary form 5a for the gear member with its side profile in a shape of a hand drum. In a second process, while the rotary member 3 is cramped from four directions with cramping metal dies 8, the intermediately formed work 5 is axially compressed to form the gear member 2 with an upper metal die 7 and a lower punch 10, which have compressing parts 7a, 10a for the inside of a material respectively. In those steps, the gear part is integrally formed by forging. The forming process prevents a folding defect or the like without causing lapping of material in filling into a tooth space 12 so that it enables the mass production of gear part such as a load sheave and a pinion gear which contribute to the miniaturization and weight reduction of a machine such as a chain block.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load sheave for use in a chain block, which engages with a motion transmitting member such as a load chain for hoisting a heavy object and hoists and lowers the same, and a drive for the same. The present invention relates to a gear component including a gear member and a rotating member, such as a shaft pinion gear, and a method for manufacturing the same.

[0002]

2. Description of the Related Art A manual chain block 31 as shown in FIG. 8 is widely used for lifting and carrying heavy objects because of its simplicity. In the chain block 31,
Drive shaft pinion gear 3 arranged in casing 32
3 is rotated by an operation of a handle (not shown) or the like, and is incorporated in the rotating shaft portion 42 of the pinion gear 33 via an intermediate gear 34 in which gears are formed in two stages, which meshes with the gear portion 41 of the pinion gear 33. And gear member 36
The rotation is transmitted to the gear member 36 of the load sheave 35 including the rotation block 37 and the rotation block 37. Then, as shown in FIG. 9, splines 36a are formed on the inner peripheral surface of the gear member 36.
However, the spline 37 is attached to the shaft portion on one end side of the rotation block 37.
a is provided respectively, and by this spline connection,
The rotation of the gear member 36 is transmitted to the rotation block 37, and the motion transmission member engaged with the rotation block 37, that is, the load chain 38 linearly moves to lift or hang a heavy object.

As shown in FIG. 8, the load sheave 35 is conventionally a gear part having a two-piece structure in which a gear member 36 and a rotating member, that is, a rotating block 37 are connected by spline connection. Gear member 36
As shown in FIG. 8 and FIG. 9, a spacer 39 necessary for assembling the chain block 31 is interposed between and.

The rotation block 37 is shown in FIGS.
As shown in FIG. 7, in order to alternately engage the links 38a of the load chain 38 having different directions of about 90 °, a pair of guide portions 40 are provided in the circumferential direction and a pair of guide portions 40 are provided on both sides to form a complicated engaging groove. The shape is not suitable for machining, and when molding by forging, the mold is easily worn, the dimensional accuracy becomes poor, and finishing machining is required, which increases the manufacturing cost etc. Therefore, there was a problem that the rotating block alone could not be mass-produced. For this reason, the gear member 36 must be manufactured by casting. On the other hand, since the gear member 36 transmits the driving force, the cast member cannot satisfy the required characteristics and is manufactured by machining or forging. Therefore, the load sheave 35 has a two-piece structure including a rotary block 37 which is a cast product and a gear member 36 which is usually a machined product.

[0005]

However, the rotary block 37 of the cast product and the gear member 36 of the machined product as described above.
In the two-piece structure, the rotation block 37 that engages the load chain becomes bulky in order to secure the required strength, the size reduction of the main body of the chain block 31 is also restricted, and the cast product and the machined product are also restricted. Since it is necessary to separately manufacture and, it takes time and labor, and further, it is necessary to interpose a spacer 39 between the rotation block 37 and the gear member 36, and there is room for improvement in assembling.

On the other hand, like the load sheave, the pinion gear 33 is also a gear part consisting of a gear part 41 and a rotating member, that is, a rotary shaft 42, as shown in FIG. 10, and the gear part 41 is conventionally machined. Processed groove 4 formed by
3 partially remains on the rotary shaft 42. When incorporating the load sheave 35, it is necessary to interpose a spacer 44 on the end surface of the gear portion 41 on the rotary shaft 42 side, and there is room for improvement in incorporation, as in the case of the load sheave 35.

Therefore, an object of the present invention is to provide a gear part and a gear part in which the gear member and the rotary member are integrally molded from the same material to be compact and lightweight, and the assembly of the machine is simplified. It is to provide a method of manufacturing economically.

[0008]

In order to solve the above problems, the present invention adopts the following configuration.

That is, in a gear component which is composed of a gear member and a rotating member and which is provided coaxially with the gear member and the rotating member, the gear member is formed by providing a flange on the end face of the gear on the rotating member side. The gear member and the rotary member are integrally formed from the same material by forging the gear member.

As described above, by forging the gear member with the flange, the gear member and the rotary member are integrally molded through the flange, and the conventional two-piece product can be made into a one-piece product. Since the spacer between the gear member and the rotating member is unnecessary, the assembly of the mechanical device is simplified. Since the gear member formed by forging has excellent characteristics such as mechanical properties as compared with the case where it is formed by machining, it is possible to reduce the weight and improve the reliability and the forming efficiency.

The rotating member may take the form of a rotating block that engages a motion transmitting member such as a chain formed by forging.

Since the rotary member for engaging the motion transmitting member such as the chain is formed by forging, it has excellent characteristics such as mechanical properties and can withstand a required dynamic continuous load. Further, as described above, by using the forged product, it is made compact and lightweight, can be used for a load sheave of a chain block, etc., and can contribute to downsizing of the machine body.

The rotating member may take the form of a rotating shaft.

With this configuration, for example, a handle or the like can be used to operate the rotation shaft to transmit the rotation to the gear portion, for example, to rotate the rotation transmission portion of the load sheave of the chain block. Can be used as a pinion gear.

In a method of manufacturing a gear part comprising a gear member and a rotary member, wherein the gear member and the rotary member are provided coaxially, a material is pressed in a direction perpendicular to its axial direction,
A first forging step of forming an intermediate compact having a preform of the gear member having a concave side surface, and axially pressing the preform to provide a flange on the end face of the gear on the rotary member side. By the second forging step of forming the gear member, the gear member and the rotating member can be integrally formed from the same material.

In this way, in the first forging step, a required preform of the gear member having a concave side surface is formed. In the second forging step, when the preform is pressure-molded in the axial direction, a frictional force acts between the end surface of the intermediate compact and the mold surface. The movement in the direction perpendicular to the axial direction is hindered,
The deformation becomes non-uniform, and the side surface of the material, that is, the side surface on the gear part side of the intermediate molded body, bulges like a barrel. When such a non-uniform deformation occurs, the above-mentioned overlapping (folding) is likely to occur in the process of filling the molding die with the gear member.
Therefore, if the side surface of the preform of the gear member of the intermediate molded body is formed in a concave shape in advance, in the pressure molding process,
Without causing barrel-shaped deformation on the side, without causing the above-mentioned overlap,
Since the molding die is filled, defects such as folding can be prevented from occurring, and the gear member and the rotating member can be integrated.

Further, in the first forging step, if the forging is performed from a direction perpendicular to the axial direction of the material, it becomes easy to form the side surface of the preform of the gear member into a concave shape.

In the first forging step, it is desirable to mold an intermediate compact having the preform of the gear member having a concave side surface and the rotating member.

According to this structure, since the rotary member is already formed in the first forging step, the gear member is molded from the preform in the second forging step,
It becomes easy to integrally form these gear member and rotating member. Further, in the second forging step, it is possible to correct the dimensional error due to wear of the die of the rotary member formed in the first forging step.

Insertion holes that do not penetrate each other from both end surfaces are provided along the axis of the intermediate molded body molded in the first processing step, and are inserted into the insertion holes in the second processing step. It is possible to mold the gear member by axially pressing both end surfaces of the intermediate molded body and the inside of the preform by a mold provided with a pressurizing unit.

In this way, the pressing portion inserted into each of the insertion holes pressurizes the inside of the preform from both sides in the axial direction. Therefore, by simply pressing from both end faces of the intermediate molded body in the axial direction, The pressure is also transmitted to the material inside the preform to which the pressure is difficult to be transmitted, and the flow of the material perpendicular to the axial direction, that is, the metal flow in this direction is promoted. As a result, the material can be easily filled into the molding die, especially at the boundary between the gear and the flange where it is difficult for the material to flow, and no overlapping occurs and defects such as folds do not occur. It is possible to prevent and form the gear member.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
Description will be given based on FIGS. 1 to 7 attached.

FIG. 1A shows a load sheave 1 which is a gear part of the embodiment of the present invention, and FIG. 2 shows a manual chain block 31 incorporating the load sheave 1. Is. The load sheave 1 is composed of a gear member 2 in which a flange portion 2b is formed at one end of a gear portion 2a, and a rotary member that engages a load chain 38, that is, a rotary block 3, which are integrally formed by forging. Has been done.

The flange portion 2b has a runout and a gear portion 2a.
The flange portion 2b is fitted into an annular hole provided in the plate 32a, and is incorporated into the chain block 31 via the pinion gear 17 in order to prevent damage to the shaft and to function as a bearing. The rotation block 3 is provided with four pairs of guide portions 3a, 3a in the circumferential direction in order to engage the links 38a of the load chain 38.
To form an engagement groove. Then, the pinion gear 17 of the drive shaft is rotated by a handle (not shown) or the like, and via the two-stage intermediate gear 34 meshed with the pinion gear 17,
The rotation is transmitted to the gear member 2, which causes the rotation block 3 to rotate and guide portions 3a, 3
The load chain 38 engaged between a moves linearly,
Lifting and hanging of heavy objects.

FIG. 3 shows a state of forming the material into an intermediate compact in the first forging step. The material 4 of the cylindrical case-hardening steel is heated to about 950 ° C. in the heating furnace.
Is closed and forged by a mechanical press in the direction perpendicular to the axial direction, that is, in the radial direction shown by the arrow, and the rotary block 3 and the gear-shaped preform of the gear member 2 in which the side surface is formed in a concave shape by one blow. The intermediate molded body 5 on which 5a and 5a are formed is molded. Then, after the intermediate molded body 5 is air-cooled to room temperature, along the axis thereof, from the end faces of the rotary block 3 side and the gear member 2 side, the insertion holes 6a of the pressing portion of the molding die that do not penetrate each other, 6b are provided respectively.

FIGS. 4 (a), (b) and (c) show the second
The finish forming state from the intermediate formed body 5 to the load sheave 1 in the processing step of FIG.
The intermediate molded body 5 provided with b is heated to a temperature of approximately 800 ° C. and set in a molding die of a mechanical press, as shown in FIG.

The molding die is shown in FIGS. 4 (a) and 4 (b).
As shown in FIG. 1, an upper die 7, a clamp die 8 for holding the rotating block 3 from four sides, a lower die 9, and a lower punch 10 are provided.
It consists of An annular pressing die 11 is arranged on the upper surface of the clamp die 8. The lower punch 10 can be raised and lowered by a hydraulic cylinder attached to the mechanical press and is clamped at a required position.

At the center of the upper mold 7, there is provided a rod-shaped pressing portion 7a which is inserted into the insertion hole 6a and presses the inside of the intermediate molded body 5 downward. A tooth groove 12 that forms the gear portion 2 a is provided on the inner peripheral surface of the lower mold 9.
A circumferential groove 13 that is continuous in the circumferential direction is provided so that the flange portion 2b is formed at the end of the rotary block 3 on the side of the rotary block 3. On the outer peripheral surface of the lower punch 10, the tooth groove 12 of the lower die 9 is formed.
A tooth profile 14 is formed so as to be slidable in the axial direction, and is inserted into the insertion hole 6b at the center of the upper surface of the tooth profile 14.
Is provided. A chamfer R is attached to both the tip end surfaces of the pressing portion 7a provided on the upper die 7 and the pressing portion 10a provided on the lower punch 10. The shape of the clamp surface of the clamp die 8 is formed so as to match the shape of the outer surface of the rotary block 3 shown in FIG.

The lower die 9 can be raised by gas pressure, and by raising the lower die 9, the lower die 9 shown in FIG.
As shown in, the rotary block 3 formed in the first forging process is clamped from four sides. And the upper die 7
Is lowered, the pressurizing portion 7a enters the insertion hole 6a, and the upper mold 7 presses the upper end surface of the intermediate molded body 5, that is, the end surface of the rotary block 3, and overcomes the gas pressure to generate the clamp mold 8. The lower die 9 and the intermediate molded body 5 are lowered together, so that the lower die 9 is pressed against the die mounting surface of the mechanical press (not shown), and the stroke of the press reaches the bottom dead center. Reach Then, as shown in FIG. 4 (c), the upper mold 7 presses the end surface of the rotary block 3, and the pressing portion 7 a provided in the center of the upper mold 7 causes the intermediate molded body 5, that is, the preform 5.
The inside of a is pressed, and the tip of the pressing portion 7a reaches the inside of the preform 5a of the gear member 2.

During this pressing process, the lower punch 10 is clamped by the hydraulic cylinder at a required position for molding the gear member 2, so that the pressurizing portion 10 provided at the center of the upper surface of the lower punch 10 is clamped.
a enters the insertion hole 6b on the gear member 2 side, and the preform 5a of the gear member 2 is formed by the reaction of the pressing force of the upper mold 7.
Both the lower end surface and the inside are pressurized. In this way, both end faces of the intermediate molded body 5 and the inside of the preform 5a are axially pressed, the preform 5a is filled in the lower mold 9, and the gear portion 2a and the flange portion 2b are formed. The member 2 is molded, and the gear component including the gear member 2 and the rotation block 3, that is, the load sheave 1 is integrally molded by forging.

In the first forging process and the second forging process described above, the molding die is heated by the burner.

The embodiment of the present invention is configured as described above, and its operation will be described below.

Insertion holes 6a provided in the intermediate molded body 5,
The pressurizing portion 7a of the upper die 7 and the pressurizing portion 10a of the lower punch 10 inserted in the preform 5 are inserted into the preform 5 from both sides in the axial direction.
Since the inside of a is pressurized, the pressure is transmitted to the inside of the preform 5a, which is difficult to transmit the pressure only by the axial pressure from both end faces of the rotary block 3 side and the gear member 2 side. , A material flow perpendicular to the axial direction, that is, a radial metal flow is promoted. Thereby, the lower mold 9 of the preform 5a, that is, the tooth groove 12 and the circumferential groove 13 is formed.
The flowability of the material to the boundary portion 15 between the tooth groove 12 and the circumferential groove 13 where the material does not flow easily becomes good, and the material does not overlap at this portion, and defects such as folds occur. The flange 2 that prevents the occurrence and plays the above-mentioned role.
A good forged product of the gear member 2 provided with b can be obtained, and it is not necessary to interpose a spacer between the gear member 2 and the rotary block 3.

In this way, since the lower mold is filled with the material well, the boundary portion 15, that is, the corner R of the contact portion between the gear portion 2a and the flange portion 2b (see FIG. 1 (b)). ) And the corner R of the tooth base of the gear 2 (see FIG. 1C) can be reduced. As a result, the efficiency of meshing the gears is increased, which can contribute to downsizing of the gear member.

When the intermediate compact 5 is pressed in the axial direction in the second forging step, the rotary block 3 is clamped at right angles to the axial direction by a clamp die 8 having a clamp surface shape matching the shape of the rotary block 3. Since the clamps are clamped in different directions, this clamp corrects the shape error of the rotary block 3 due to abrasion of the molding die in the first forging process, and the axial direction by the upper die 7 and the lower punch 10. In the process of pressurizing the gears 2a and the flange 2b, the rotary block 3 is not deformed and its shape is maintained. By the action of the clamp die 8 as described above,
The dimensional accuracy of the rotating block having a complicated shape is secured, and its practical forming by forging is possible.

Further, in the first forging step, the preform 5a of the gear member 2 of the intermediate molded body 5 is formed in a concave shape in advance so that the intermediate molded body 5 is axially shaped. Even when the above-mentioned non-uniform deformation occurs due to the action of frictional force between the upper die 7 and the lower punch 10 and the end surface of the intermediate molded body 5 during pressure molding, the side shape of the preform 5a becomes a barrel shape. Does not swell. In addition, in combination with the effect of accelerating the metal flow in the radial direction by the axial pressing by the pressing portions 7a and 10a of the upper mold 7 and the lower mold 9, overlap occurs in the process of filling the mold with the material. In particular, in particular, the overlapping at the boundary portion 15 between the gear portion 2a and the flange portion 2b is prevented, and the occurrence of defects such as folding is surely prevented.

The hourglass-shaped side surface of the preform 5a is easily formed by forging the columnar material 4 in a direction perpendicular to the axial direction, that is, in the radial direction.

In order to engage a wire rope or a V-belt instead of the load chain, as shown in FIG. 5, the rotary block 3 has an inner peripheral surface inclined downward and a bottom surface having an arc shape. The engaging groove 16 can be formed.

FIG. 6 shows a gear part of another embodiment,
3 shows a pinion gear 17 used for a drive shaft of a manual chain block 31 (see FIG. 2). The pinion gear 17 includes a gear portion 18a and a flange portion 18b.
And a rotary member, that is, a rotary shaft 19, and the flange portion 18b is a gear portion 18a.
Is formed on the end surface of the rotating shaft 19 side, and a supporting shaft portion 19a is formed on the tip end surface. Then, as described above, by rotating the rotary shaft 19 with a manual handle or the like, the gear member 18 rotates, and the gear member 2 of the load sheave 1 is transferred to the gear member 2 via the intermediate gear 34 (see FIG. 2). The rotation is transmitted and the rotation block 3 rotates, and the load chain 38 linearly moves to lift or hang a heavy object.

In the first forging step of the pinion gear 17, as in the case of the load sheave 1, the material of the columnar case-hardening steel heated to about 950 ° C. in the heating furnace is
By the mechanical press, an intermediate compact is obtained which is closed and forged in the direction perpendicular to the axial direction, that is, in the radial direction, and in which the hourglass-shaped preform of the gear member having a concave side surface is formed. Then, this intermediate compact is air-cooled to room temperature and then subjected to the second forging step.

FIGS. 7 (a) and 7 (b) show the state of finish forming from the intermediate compact 20 to the pinion gear 17 in the second forging process.
Is reheated to a temperature of about 800 ° C. and set in a molding die of a mechanical press, as shown in FIG. 7 (a).

As shown in FIGS. 7 (a) and 7 (b), the molding die has a tooth groove 21 formed in the circumferential direction and a circular molding groove 22a of the supporting shaft portion 19a formed at the center. And a lower metal mold having a cylindrical groove 23a for holding the rotary shaft portion 20a of the intermediate molded body 20 and a circumferential groove 23b for forming the flange portion 18b at the upper end thereof. It consists of a mold 23. The lower die 23 is fixed to a die installation surface of a mechanical press, and a knockout hole 24 is provided in a lower portion of the lower die 23. A knockout pin having a flat tip has a tip surface of the cylindrical groove 23a. It is designed to be inserted to match the bottom surface.

In this state, the upper mold 22 is lowered to press the upper end surface of the intermediate molded body 20, that is, the upper end surface of the preform 20b of the gear member 18 having a concave side surface. The upper end portion of the rotary shaft portion 20a adjacent to it is deformed, and as shown in FIG. 7B, the space portion formed by the upper mold 22 and the lower mold 23 is filled with the gear having the flange 18b. The member 18 is formed.
After the pressurization is completed, the upper mold 22 is raised and the molded product forming the gear member 18 is knocked out. Then, after air cooling to room temperature, the rotary shaft portion 20a and the gear portion 1
Finish machining is performed on the end face of 8a.

In the first forging step, the preform 20b of the gear member 18 of the intermediate compact 20 is formed into a concave side face shape in advance, like the case of the load sheave 1 described above. Therefore, when the intermediate molded body 20 is pressure-molded in the axial direction, even if the above-mentioned uneven deformation occurs due to the action of the frictional force on the contact surface between the upper mold 22 and the intermediate molded body 20, The side shape of the reform 20b does not bulge into a barrel shape, and the tooth groove 21 and the molding groove 22 of the upper mold 22 are not formed.
a and in the process of filling the circumferential groove 23b of the lower mold 23,
It is possible to prevent the occurrence of defects such as folding at the boundary between the gear portion 18a and the flange portion 18b where the overlapping is not likely to occur and the overlapping of the materials is not likely to occur.

In the case of the pinion gear 17, the sectional shape of the preform 20b is the same as that of the load sheave 1 described above.
Since it is smaller than the cross-sectional shape of the preform 5a in this case, it is possible to fill the upper and lower molds 22 and 23 without causing an overlap even without applying internal pressure in the axial direction.

[0046]

As described above, according to the present invention, by forging a gear member with a flange, a gear component including the gear member and a rotary member such as a rotary block or a rotary shaft can be integrally formed. Then, depending on the type of the gear component, either the process of forging both the gear member and the rotating member or the process of forging only the gear member can be performed.

The gear parts integrally molded in this way are made compact and lightweight due to the excellent properties such as mechanical properties of the forged product, the reliability is improved, and the gear member is formed by machining. The production efficiency is improved compared to the case. Further, the assembly of the mechanical device can be simplified and the machine main body such as the chain block can be miniaturized. For example, the conventional cast product and the forged product can be integrally molded into a one-piece product.

[Brief description of drawings]

FIG. 1A is a perspective view of a gear component (load sheave) according to an embodiment of the present invention, FIG. 1B is a partially omitted side view of the same, and FIG.

FIG. 2 is a partially omitted cross-sectional view showing a structure of a chain block incorporating a load sheave and a pinion gear according to an embodiment.

FIG. 3 (a) is a perspective view of a material used in the first forging step of the above-described gear component, and FIG. 3 (b) is a perspective view of an intermediate compact formed in the first forging step in FIG. 3 (a).

FIG. 4 (a) is an explanatory view showing a die configuration and a work material in a second forging process of the above-mentioned gear part, and FIG. 4 (b) is a clamp state of the work material of the clamp die shown in FIG. Explanatory view showing a state in which a workpiece is pressure-molded by the mold shown in (c) and (a) of FIG.

5A is a perspective view of a gear part (load sheave) of another embodiment, and FIG. 5B is a vertical sectional view of the same.

FIG. 6 is a perspective view of a gear component (pinion gear) according to another embodiment.

FIG. 7 (a) is an explanatory view showing a die structure and a work material in the second forging step of the above-described gear part, and (b) a work material is pressure-molded by the mold shown in FIG. 7 (a). Explanatory diagram showing the state

FIG. 8 is a partially omitted sectional view showing the structure of a chain block.

FIG. 9 is a perspective view of a conventional two-piece load sheave.

FIG. 10 is a perspective view of a conventional pinion gear.

[Explanation of symbols]

1 road sheave 2 gear members 2a Gear part 2b Flange part 3 rotating blocks 3a Guide part 4 material 5 Intermediate compact 5a preform 6a, 6b insertion hole 7 Upper mold 7a Pressure section 8 clamp mold 9 Lower mold 10 Lower punch 10a Pressure unit 11 Presser die 12 Tooth groove 13 circumferential groove 14 tooth profile 15 border 16 engagement groove 17 pinion gear 18 Gear member 18a gear part 18b Flange part 19 rotation axis 19a Support shaft 20 Intermediate molded product 20a rotating shaft 20b preform 21 Tooth groove 22 Upper mold 22a forming groove 23 Lower mold 23a cylindrical groove 24 Knockout hole 31 chain block 32 casing 32a plate 34 Intermediate gear 38 Road Chain

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16H 55/17 F16H 55/17 AZ 55/30 55/30 A

Claims (6)

[Claims] 1. A gear component comprising a gear member and a rotary member, wherein the gear member and the rotary member are coaxially provided,
The gear member is formed by providing a flange on the end surface of the gear on the rotary member side, and the gear member and the rotary member are integrally molded from the same material by forging at least the gear member. Gear parts characterized by that. 2. The gear component according to claim 1, wherein the rotating member is a rotating block that engages a motion transmitting member such as a chain formed by forging. 3. The gear component according to claim 1, wherein the rotating member is a rotating shaft. 4. A method of manufacturing a gear component, comprising a gear member and a rotating member, wherein the gear member and the rotating member are provided coaxially with each other, wherein a material is pressed in a direction perpendicular to its axial direction, and a side surface is concave. A first forging step of forming an intermediate molded body on which a preform of the gear member is formed, and a gear member in which a flange is provided on the end face of the gear on the rotating member side by pressurizing the preform in the axial direction. A method of manufacturing a gear component, wherein the gear member and the rotary member are integrally molded from the same material by a second forging step for molding. 5. The gear according to claim 4, wherein in the first forging step, an intermediate molded body is formed in which a preform of the gear member having a concave side surface and the rotating member are formed. Manufacturing method of parts. 6. An insertion hole, which does not penetrate each other from both end faces thereof, is provided along the axis of the intermediate molded body molded in the first forging step, and in the second forging step,
The gear member is formed by axially pressurizing both end surfaces of the intermediate molded body and the inside of the preform by a mold provided with a pressurizing portion to be inserted into each of the insertion holes. A method for manufacturing a gear component according to claim 4.